Machine for turning or threading bolt blanks and the like



July 29, 1930. 1, KlNDERvATER 1,771,713

MACHINE FOR TURNING OR THREADING ABOLT BLANKS AND THE LIKE Filed June 27, 1925 2 Sheets-Sheet 1 f ll g fz] e L F75 /Z' ZZ 5/ 4 I V L- 9 j 5 wua/wtofa July 29, 1930. J. KINDERVATER 1,771,713'

MACHINE FOR TURNING OR THREADING BOLT BLANKS AND THE LIKE Filed June 27, 1923V 2 Sheets-Sheet 2 36 me/who@ @351i @Jr/50914013v Jul. /1/5 /vDf/m TER.

Patented July 29, Y1930 UNITED STATES PATEN Y JULIsKINDERvATEn, or RICHMOND, VIRGINIA, AssIGNoR 0F NEW YORK, N. y.

To WALTER .Hf FOSTER,

`NIAiJHINE Non TUnNINGfon THREADING BoLrBLaNxs AND THE Illini` f Application inea June 27,

` "Myinvention aims to provide amachine forturning or threadingand at the same time producing a' proled product; that is, one whichl is not o'fthesame size throughout its" length. V v

The accompanying drawings illustrate a machine `embodying the invention, in'which Fig. 1 isa front elevation; y

Fig. 2'is a vertical cross-section, showmg parts Vin elevation; l

Fig. 3 is a side elevation partly 1n section showing aprofilebar;`

Fig'. 4 is a plan, .partly broken away, of the cutter head and related parts;

i Fig. 5 is a front elevation of the same parts; ,1^ Y Figj is asimilar view showing a different position of the mechanism;

Fig. 7 is an elevation of a` bolt the machine. p

The invention isapplicable to varioustypes Of machine. l have shown it applied to a single unit of a known style of multiple vertical machines which is used for making stayboltsfand the like. This'machine has a base 1 with uprights 2 and 3 and a cross-head 4; A blank 5 is supported atits lower end 1n a socket 6 whichis rotated by suitable gearing so asto turn the blank.` A cutter-headindicated as a whole at 7 surrounds the blank and has its cutter engaging the same and travels downward along the blank, soas to turn the latter as it is rotated. The upper end ofthe blank is held by a centering device 8. The cutterfhead iscarried at'the lower ends of rods 9 which pass freely through ears of the centering device 8 and .which at their upper produced in ends are attached to a nut 10 cna threaded shaft 11 which is supported in bearings at its lower end and rotatedloy means ofgearing in la box 12. Alsothe'nut 10 togethervv with the supporting rods and cutter-headv are suspended from straps 13 which pass over friction pulleys 14 and carry counterweights 15. at their ends.V `The nut 10 is engaged with the screw shaft 11- when vthe'cutter-head is" to be fed downward.` When it is to be lifted thenutwhich is a divided nut, is disengaged y from the shaft 1l, and the rotating friction pulleys 14 lift the cutter-head rapidly to the 192s. 'pseiril Nofeezeef top of its travel, tthe same time lifting the centering head'S and freeing'the; blank.

The cutter-head comprises a casingpor-` tion 16, Figs. 4 and ,5, with lateral yarms 1f( and 18 having elongated slides 19 and `20`fat` their ends whichfit in guides in the'columns 2 and '3jof thel machine.` The cutters`21 are mounted in blocks 22 which are carried by pivot-pins 23 mounted in the topfof the casing and which are `connected-by toggle links 24 to apart which is rotatablysupported in the casing of the head. y Thepart which is' rotatable comprises two rings.' Therin'g 40 projectsupwardwithin the ring .'25'as indi,-

cated in Fig. 4 and carries directly the pivoted 65 outer endslof` thetogglelinks. The ring`25 is angularly adjustable on the ring40 as hereinafter explained. When the y' ringV 25` is turned tothe right (clockwise in Fig.- 4) the rmg 40 moves similarly4 andthe cutters are moved inward to turn the blank to a smaller diameter, and whenthe ring is turned 'inthe opposite direction the "cutters arefarther separated. Aspring 26 tends` to turn fthe' ring,25in the direction to open thecutters. The ring is turned more/or less inthe closed direction by `means of Ta profile'ba-r shown rin'Fig. 3 consisting ofarsupporting member 27 `on the face of which is detachably fastened a profile member v28, the con.- tour of whichis such as to produce thede-` siredopening and l'closing `of the cutters to turn the blankl to the desired diameters at successive points in its lengthytheface of the profile barfbears on a tumbler 29 fon` a pin 30 which projects from the side of the ring25. i y The profile bar is suspended by 'a pin 31, Fig. 3, fromthe cross-head4 ofthe machine-f and is locatedso that the backlof itl-bears against ashoulder32on a Xed parto'f thev head, `the lateralextension 18.- `Bylocating the profile bar in this'1 way between therelaL` tively movable" parts of the head,- a',v ery,=.|. c V curatecontrol of the cutters issecuredl* If the head moves laterally in its vertical guides, the profile bar movesvwith it because ofthe loose .support of the bar at` its upper end. 1 Consequently any such lateral movement of the head has no effect on the adjustment Vof l Vthe cutters or on the profile of the work.

The tumbler 29 is for the purpose of permitting a return movement of the carrier 5, without closing the cutters on the work. On

the downward movement, as shown in Fig. 5,

Y it bears against the .proilebar which forces the cutters in as explained above.Y On the uphold the cutters wide open, pressing the ltilted tumbler against the profile bar. To prevent tilting on the downward movement thev tumbler has a tail 33 which bearson a stopfpin 34 carried by a bracket 35 which is'fa'sten'ed on the projection 36 atthe sideof the ring 25 which projection also carries thepivot-pin 30,

ofthe tumbler.

he. head is provided also'witli ahand adi l. justment for setting the two rin-gs of the movable part' with relation to eachother. The ring 25 is carried in adjustablerv relation with the ring 4Q which projects upward within the ring 2 5 and carries the pivots 41 ofthe toggles as showniin Fig. 4. `The ring 25, in-any posiv tion Vin which it is, held by the profile bar,

serviesas an abutment in relation with the ringf40 to adjust the tools inward orv outward. The' adjusting means shown is of a common typeconsisting of a scale 42 carried by the part V25 against which slides a block y48 pivotally mounted on astud 44 at theside of the ringl 40. Y The scalle42 carries at its left-hand end a nut 4 5 pivoted on 1 a vertical axis,

. through which is screwed .-a screw y46.V passing through the block 43', engaging thevlatter by shoulders at Vopposite sides so as to. prevent turned therein byfmeans of thehead 47. A s etsc'rew 48 servesto clamp the screw'46 Vin the nut 4 5.` Thusthe two rings 25 and 40v are fixed in any desired relative adjustment, the

bler 29 against the profile bar. The screw 46 may be turned to provide a greater or less opening of the cutters. This adjustment therefore is an absolute one which determines the initial diameter of the work and which is supplemented by thev action of the profile bar in determining thetaper of the work(l rI he cutter head is very accurately controlled as I have described above; vand the addition of a centering device 8 at the upper end,

VceLoperating with the centering 'socket at the lower end, by helcl-ijngft'ln'e blank accurately assiste fin securing anaceurately turned prod uct. f The centering device is illustratedonly inroutl-ine.: It .may 'beef 'any one-of various knowny types. Theydesirgn `illust'rated com` prisesa vertically movable' carriage guided by the uprightsend 3, This carriage supports thegdeadA center Se and. preferably provided withmeans (notshow'in) by whichit can be r'igidlyclamped 'to the Xed uprights. At

the beginning of theoperatidn 'the head 7 is ward movement, Fig. 6, it is tilted in the mannershownand the spring is allowed.' tov longitudinal movementtherein, and free to be rin`gv25 rbeing fixed bythe bearing of the tum-V lifted, and when it reaches the carriage of the centering device it carries the same up if the clamping means thereof have been previously released, it being remembered that the suspension rods 9 pass freely through the ears of the carriage. A y blank is inserted with its polygonal/head .in thesocket 6. The cutterhead 7 is then lowered lto a position which aligns the tools thereof with the end of the work. 1 At the same time the carriage 8 fol! lows downward and the point or dead center Sfengages a conicalrecess formed in the end of the blank and the'carriage is then clamped to the uprights. Thus the work is accurately centered'for the turning or threading operation', which inturn is accurately controlled by the absolute adjustment of the cutters and by thetaper ofthe controlling profile bar.

The cutters referredtomay be either turning cutters for rounding the blank or they may be chasers or threading cuttersfor formingthe threads on the bolt. `Or the cutterhead may carry both turning cutters and chasers as has-been done in4 somemachines Fig. 7 indicates a product of the machine, using turning cutters. This-is a blank with a head 37 and a tapering shank. 38, theA end- 39 kof which is beveled.r .The product of thema chine maybe eitherfsuch a blank turned to approximate size and'shape and ready to'bc threaded 1n another machine, or may be a finished, threaded bolt. And the profile bar may be shapedto.producea continuous taper as illustrated or to `produce various other proles. l

Though I have described with great particularity of detail a. certain embodiment of.

my invention yet it is not to be understood therefrom that the invention is restricted to the particular embodiment described. Variousmodifications in detail and inthe arrangement of the parts mayl be v.made by those skilled vin the art without departing from the inventionas defined in the following claims.

What I claim is 1. A machine for cutting bolt blanks including in combination a cutter-head carrying .a plurality of cutters embracing the work, said cutters being swingable in an arc, a tapered profile bar suspended from a pivot situated beyond the highestcp'ointof travel of the cutterehead, a portionof said profile bar being situatedbetween two parts of the head andadapted to cause a separation or ap proach of said parts so as to swing the cutters toward or'from the work. 1

2.* The combination with-a cutter-'head hay ing two partsone turnin von ,the ,other .and loosely pivotedprole 'ar for-controlling such relative movement, land meanssecured to one part of saidicutter-head arranged te' adoperate with said prole' bar during 'the cutting movement, of thecutterfhead andar ranged to move to inoperative position during opposite movement f the cutter-head,

i the relative movement of the two parts of the erative during a retracting movement of the 3. rI he combination With a cutter-head including two part-s one rotatably mounted on the other cutters swingable in an arc arranged to be moved toward and from the 5 work in response to relative movement between two parts of the cutter-head so as to vary the size of the work out, a vertically extending prolile bar loatingly pivoted above the cutter-head, and means for controlling cutter-head including a tumbler which is 0perative to cause an advance of the cutters toward the work during cutting movement of the head and is automatically rendered inopcutter-head.

t. The combination with a cutter-head having vertical movement and comprising two parts one arranged to turn with respect to the other, cutters swingable in an arc carried by said head and adapted by such turning movement to vary the size of the work cut and a profile bar pivotally suspended independently of the head acting against one of the parts a5 thereof and reacting against the other so as to control 'such relative movement and means for manually adjusting the relation of said parts to each other.

In witness whereof, I have hereunto signed my name.

JULIUS KINDERVATER. 

